.container {
    flex-direction: column;
    padding-left: 20px;
    padding-right: 20px;
}

.title {
    font-size: 30px;
    text-align: center;
    width: 100%;
    margin-top: 20px;
    margin-bottom: 20px;
}

.btn {
    margin-top: 20px;
    margin-bottom: 20px;
    padding: 15px;
}

.label {
    margin-top: 20px;
    font-size: 40px;
    color: green;
}

.result_area {
    padding-left: 20px;
    padding-right: 20px;
    font-size: 35px;
    margin-top: 16px;
}